| Acronym | Definition |
|---|
| IID | Imperial Irrigation District (California) |
| IID | If in Doubt |
| IID | Ignition Interlock Device (automotive security system) |
| IID | Invention, Innovation and Design (Malaysia) |
| IID | Incident Identification |
| IID | Instruction Identification |
| IID | Instance Identifier |
| IID | Interface Identifier |
| IID | Inspector Identification |
| IID | Image Identification |
| IID | Interface Identifier (Component Object Model) |
| IID | Independent & Identically Distributed (statistics) |
| IID | International Institute for Democracy (est. 1987) |
| IID | Imperial Institute of Design (India) |
| IID | Integrated Infrastructure Development |
| IID | Indian Institute of Development |
| IID | Improvised Incendiary Device |
| IID | Institute for Interreligious Dialogue |
| IID | Information for Investment Decisions, Inc. |
| IID | Infinite Improbability Drive (Hitchhikers Guide to the Galaxy by Douglas Adams) |
| IID | Internal Investigations Division (law enforcement; various locations) |
| IID | Iterative Incremental Development |
| IID | Internal Iterative Deepening (chess programming technique) |
| IID | Insulin Independent Diabetes |
| IID | Instituto de Investigación de Diabetes (Spanish: Diabetes Research Institute) |
| IID | Integrated Information Display |
| IID | Integrated Interoperability Demonstration |
| IID | Indian Institute of Design (New Delhi, India) |
| IID | Infrared Intrusion Detection |